Fan



FIG. 1 is a top, front and left side perspective view of a fan showing my new design;

FIG. 2 is a top, rear and left side perspective view thereof;

FIG. 3 is a left side elevational view thereof shown angled upwardly, the opposite side being a mirror image; and

FIG. 4 is a bottom, rear and left side perspective view thereof shown angled downwardly. 

The ornamental design for a fan, as shown and described. 